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  1. x^2 - kx + 4 = 0 apply the discriminant formula a = 1 , b = - k, c = 4 b^2 - 4ac = 0 (-k)^2 - 4(1)(4) = 0 k^2 - 16 = 0 k^2 = 16 k = √(16) k = 4 answer// x^2 - 4x + 4 = 0 (x - 2)(x - 2) = 0 x = 2

    8 Answers · Science & Mathematics · 19/05/2019

  2. ...k)  vertices (h,k±a)  co-vertices (h±b,k)  foci (h,k±c), c² = a²-b²   (y-10)²/10² + (x-5)²...

    4 Answers · Science & Mathematics · 21/05/2019

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